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PSA 10: PriceCharting; refreshed Sep 10, 2026
GemDelta shows Mewtwo (Promo #XY100) at $26.88 market price (TCGplayer market). Its Delta multiple is 15.0x.
A PSA 10 Mewtwo (Promo #XY100) is currently shown at $250. GemDelta labels this as an unverified PriceCharting guide fallback rather than verified recent sales.
GemDelta records a 2.28% gem rate for Mewtwo (Promo #XY100), with 7 PSA 10 copies out of 307 total PSA grades and a 15.0x Delta. That describes the grading profile; it is not financial advice.